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State machine choice

  1. Nov 19, 2005 #1
    What are some possible criteria when to choose Mealy or Moore state machine?
    I know that for Mealy, output is a function of present state and input and in Moore it's just present state. I know it also probably depends on the design specifications, but ... just wondering.

    Any insights are very much appreciated.
    Last edited: Nov 19, 2005
  2. jcsd
  3. Nov 21, 2005 #2


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    It's difficult to say in general other than that given definition. It's important to be able to identify how a machine works and knowing whether it is Mealy verus Moore is part of it. For design purposes, you can see that a machine that has output as a function of state only is somewhat 'better' due to its synchronous nature. Moore machines usually have the output and input buffered by some kind of sequential logic (flip-flops and latches), while Mealy machines usually have part of the output directly coming from the input through some combinational logic.
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